A theoretical model to numerically study the local space-charge field induced by light in a photorefractive crystal biased with two independent, perpendicularly oriented external static fields is introduced. This model appears attractive because it allows varying, in the crystal transverse plane, of the orientation of the external biasing static field with respect to that of the optical-field vector, then enhancing the tensorial properties of the crystal. The numerical analysis has revealed that, in a nonconventional biasing configuration, the spatial distributions of the space-charge-field vector transversal components exhibit a further anisotropy that has not been shown up to now. Nevertheless, from a practical point of view, such a boundary configuration could allow better management of the focusing characteristics of the material.
Index Terms—Nonlinear optics, nonlinear wave propagation, optical
self-focusing, optical solitons, photorefractive effects,
photorefractive materials.
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Figure 1. Photorefractive beam fanning, a self-action nonlinear optical effect. |
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A complete source code to calculate photorefractive space-charge field with conventional and unconventional biasing schemes. For more information: |
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Claudio Crognale and Luigi Rosa,
“Vector Analysis of
the Space-
Charge Field in Nonconventionally Biased Photorefractive Crystals”, Journal of Lightwave Technology, Vol. 23, No. 6, pp. 2175-2185, June 2005. |
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Claudio Crognale and Luigi Rosa,
“Non-conventional biasing scheme for re-configurable bulk
optical beam polarization converters based on
centrosymmetric photorefractive crystals”, U.S. Patent,
pending. |
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We recommend to check the secure connection to PayPal, in order to avoid any fraud. This donation has to be considered an encouragement to improve the code itself. |
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Photorefractive Simulator System. Click here for
your donation. In order to obtain the source code you
have to pay a little sum of money: 99,90 EUROS (less
than 139,86 U.S. Dollars). |
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Once you have done this, please email us luigi.rosa@tiscali.it As soon as possible (in a few days) you will receive our new release of Photorefractive Simulator System. Alternatively, you can bestow using our banking coordinates:
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The authors have no relationship or partnership
with The Mathworks. All the code provided is written in Matlab
language (M-files and/or M-functions), with no dll or other
protected parts of code (P-files or executables). The code was
developed with Matlab 14 SP1. The code provided has to be considered "as is" and it is without any kind of warranty. The
authors deny any kind of warranty concerning the code as well
as any kind of responsibility for problems and damages which may
be caused by the use of the code itself including all parts of
the source code.
